From @schwern

bash-2.02$ /usr/local/perl5.005_60/bin/perl -dw /usr/local/perl5.005_60/bin/pod2html

Loading DB routines from perl5db.pl version 1.0402
Emacs support available.

Enter h or `h h' for help.

Assertion failed​: file "pp_ctl.c", line 2430, <DATA> line 212.
Debugged program terminated. Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.
  DB<1>

This is just trying to run pod2html that comes with 5.005_60 under the
debugger with warnings on. Interestingly, it works without the
debugger on.

I brought the case down to​:

#!/usr/local/perl5.005_60/bin/perl
  eval 'exec /usr/local/perl5.005_60/bin/perl -S $0 ${1+"$@​"}'
  if $running_under_some_shell;

use Pod​::Html;

That's enough to get the assertation to fail. Strangely enough it
-has- to be Pod​::Html. I tried a few other modules and nothing seemed
to do it.

Maybe it just hates tchrist? ;)

Summary of my perl5 (revision 5.0 version 5 subversion 60) configuration​:
  Platform​:
  osname=linux, osvers=2.2.10, archname=i686-linux
  uname='linux athens 2.2.10 #3 smp mon aug 2 16​:48​:09 edt 1999 i686 unknown '
  config_args=''
  hint=recommended, useposix=true, d_sigaction=define
  usethreads=undef useperlio=undef d_sfio=undef
  use64bits=undef usemultiplicity=undef
  Compiler​:
  cc='cc', optimize='-g', gccversion=2.95 19990728 (release)
  cppflags='-Dbool=char -DHAS_BOOL -DDEBUGGING -DDEBUGGING_MSTATS -DDEBUGGING_OPS'
  ccflags ='-Dbool=char -DHAS_BOOL -DDEBUGGING -DDEBUGGING_MSTATS -DDEBUGGING_OPS'
  stdchar='char', d_stdstdio=define, usevfork=false
  intsize=4, longsize=4, ptrsize=4, doublesize=8
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
  alignbytes=4, usemymalloc=y, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -L/usr/local/lib'
  libpth=/usr/local/lib /lib /usr/lib
  libs=-lnsl -lndbm -lgdbm -ldbm -ldb -ldl -lm -lrt -lc -lposix -lcrypt
  libc=/lib/libc-2.1.2.so, so=so, useshrplib=false, libperl=libperl.a
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-rdynamic'
  cccdlflags='-fpic', lddlflags='-shared -L/usr/local/lib'

Characteristics of this binary (from libperl)​:
  Compile-time options​: DEBUGGING
  Built under linux
  Compiled at Aug 6 1999 23​:43​:33
  @​INC​:
  /usr/local/perl5.005_60/lib/i686-linux
  /usr/local/perl5.005_60/lib
  /usr/local/perl5.005_60/lib/site_perl/5.00560/i686-linux
  /usr/local/perl5.005_60/lib/site_perl
  .

--

Michael G Schwern schwern@​pobox.com
  http​://www.pobox.com/~schwern
  /(?​:(?​:(1)[.-]?)?\(?(\d{3})\)?[.-]?)?(\d{3})[.-]?(\d{4})(x\d+)?/i

From @schwern

Damnit, it happened again, this time in 5.005_61​:

$ /usr/local/perl5.005_61/bin/perl -Mblib -d t/fields.t

Loading DB routines from perl5db.pl version 1.0402
Emacs support available.

Enter h or `h h' for help.

Assertion failed​: file "pp_ctl.c", line 2430.
BEGIN failed--compilation aborted.
Debugged program terminated. Use q to quit or R to restart,
  use O inhibit_exit to avoid stopping after program termination,
  h q, h R or h O to get additional info.
  DB<1>

The assertation is​:
assert(CATCH_GET == TRUE)
which is just checking to see if PL_top_env->je_mustcatch is true (it isn't).

I found the following comment in scope.h which might prove useful​:
* je_mustcatch, when set at any runlevel to TRUE, means eval ops must
* establish a local jmpenv to handle exception traps. Care must be taken
* to restore the previous value of je_mustcatch before exiting the
* stack frame iff JMPENV_PUSH was not called in that stack frame.
* GSAR 97-03-27

I guess care wasn't taken. :(

Something in blib.pm is tripping the assertion, because if I use
-Iblib/lib instead of -Mblib I don't get the error.

For what its worth, here's a stack backtrace​:

#0 S_docatch (o=0x82ba1c8) at pp_ctl.c​:2427
#1 0x80e2e25 in Perl_pp_require () at pp_ctl.c​:3007
#2 0x80abbee in Perl_runops_debug () at run.c​:57
#3 0x805cecd in S_call_xbody (myop=0xbffff458, is_eval=0) at perl.c​:1347
#4 0x805c87e in perl_call_sv (sv=0x8234474, flags=2) at perl.c​:1235
#5 0x809e4ed in Perl_vwarn (pat=0x811a0e6 "%_", args=0xbffff4f8)
  at util.c​:1637
#6 0x809e640 in Perl_warn (pat=0x811a0e6 "%_") at util.c​:1672
#7 0x80e64dc in Perl_pp_warn () at pp_sys.c​:436
#8 0x80abbee in Perl_runops_debug () at run.c​:57
#9 0x805cecd in S_call_xbody (myop=0xbffff718, is_eval=0) at perl.c​:1347
#10 0x805ce74 in S_call_body (args=0xbffff6d4) at perl.c​:1331
#11 0x80d532e in Perl_vdefault_protect (excpt=0xbffff704,
  body=0x805ce40 <S_call_body>, args=0xbffff6b4) at scope.c​:44
#12 0x80d5260 in Perl_default_protect (excpt=0xbffff704,
  body=0x805ce40 <S_call_body>) at scope.c​:25
#13 0x805cb3e in perl_call_sv (sv=0x8136020, flags=6) at perl.c​:1266
#14 0x805ff24 in S_call_list_body (args=0xbffff890) at perl.c​:3045
#15 0x80d532e in Perl_vdefault_protect (excpt=0xbffff8a8,
  body=0x805fecc <S_call_list_body>, args=0xbffff874) at scope.c​:44
#16 0x80d5260 in Perl_default_protect (excpt=0xbffff8a8,
  body=0x805fecc <S_call_list_body>) at scope.c​:25
#17 0x805fbee in Perl_call_list (oldscope=1, paramList=0x81360c8)
  at perl.c​:2988
#18 0x8089694 in Perl_newSUB (floor=78, o=0x82639c8, proto=0x0,
  block=0x8136f88) at op.c​:4122
#19 0x8085955 in Perl_utilize (aver=1, floor=78, version=0x0, id=0x8135408,
  arg=0x0) at op.c​:2816
#20 0x807d265 in Perl_yyparse () at perly.y​:333
#21 0x805bcdb in S_parse_body (args=0xbffffb64) at perl.c​:953
#22 0x80d532e in Perl_vdefault_protect (excpt=0xbffffb74,
  body=0x805b350 <S_parse_body>, args=0xbffffb44) at scope.c​:44
#23 0x80d5260 in Perl_default_protect (excpt=0xbffffb74,
  body=0x805b350 <S_parse_body>) at scope.c​:25
#24 0x805b25f in perl_parse (my_perl=0x8128808, xsinit=0x8059778 <xs_init>,
  argc=4, argv=0xbffffc24, env=0x0) at perl.c​:632
#25 0x8059719 in main (argc=4, argv=0xbffffc24, env=0xbffffc38)
  at perlmain.c​:51

And the value of *PL_top_env at that point​:
{je_prev = 0xbffff7a0, je_buf = {{__jmpbuf = {64, 135090752, 1075154995,
  -1073744244, -1073744460, 135090921}, __mask_was_saved = 1,
  __saved_mask = {__val = {0, 0, 3221223288, 3221223148, 135090990,
  3221223220, 1, 3221223020, 134959818, 64, 1074949332, 135491584,
  134620189, 135466292, 0, 0, 3221223424, 64, 135090752, 1075154995,
  3221223148, 3221222932, 135090921, 1, 0, 0, 3221223136, 0, 4, 4, 16,
  0}}}}, je_ret = 0, je_mustcatch = 0 '\000', je_throw = 0}

Attached is a copy of the code which I was testing that caused the
problem. Its the complete directory tree, every file. Just cd into
Class-Fields and run /usr/local/perl5.005_61/bin/perl -Mblib -d
t/fields.t

--

Michael G Schwern schwern@​pobox.com
  http​://www.pobox.com/~schwern
  /(?​:(?​:(1)[.-]?)?\(?(\d{3})\)?[.-]?)?(\d{3})[.-]?(\d{4})(x\d+)?/i

From @schwern

Class-Fields.tar.gz

From The RT System itself

fixed in bleadperl DEVEL7093